21880760 has 48 divisors (see below), whose sum is σ = 53949240. Its totient is φ = 7920960.

The previous prime is 21880759. The next prime is 21880763. The reversal of 21880760 is 6708812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98009 + ... + 98231.

Almost surely, 2^21880760 is an apocalyptic number.

21880760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21880760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26974620).

21880760 is an abundant number, since it is smaller than the sum of its proper divisors (32068480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21880760 is a wasteful number, since it uses less digits than its factorization.

21880760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 21880760 is about 4677.6874628389. The cubic root of 21880760 is about 279.6967805978.

The spelling of 21880760 in words is "twenty-one million, eight hundred eighty thousand, seven hundred sixty".